Add debug package

[raphael]

The debug package provides the following functionality:

• MountDebugLogEnabler mounts a handler on a HTTP mux to turn on or off debug logs.
• MountPprofHandlers mounts the pprof handlers on a HTTP mux.
• LogPayloads is a Goa endpoint middleware that logs request and result payloads.

[codecov-commenter]

Codecov Report

Merging #178 (04144e7) into main (a7acae8) will increase coverage by 0.20%.
The diff coverage is 94.48%.

❗ Current head 04144e7 differs from pull request most recent head 70d6e95. Consider uploading reports for the commit 70d6e95 to get more accurate results

@@            Coverage Diff             @@
##             main     #178      +/-   ##
==========================================
+ Coverage   91.90%   92.10%   +0.20%     
==========================================
  Files          28       32       +4     
  Lines        1495     1622     +127     
==========================================
+ Hits         1374     1494     +120     
- Misses         89       95       +6     
- Partials       32       33       +1     

Flag	Coverage Δ
micro	92.10% <94.48%> (+0.20%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
log/options.go	87.50% <0.00%> (-6.74%)	⬇️
log/context.go	75.75% <66.66%> (-3.41%)	⬇️
debug/debug.go	100.00% <100.00%> (ø)
debug/goa.go	100.00% <100.00%> (ø)
debug/grpc.go	100.00% <100.00%> (ø)
debug/options.go	100.00% <100.00%> (ø)

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